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Volume 2, Issue 3 March 2014

S.No. Title Page No.
Sol-Gel Synthesis Of Silica Xerogel Film Doped Uv Dye Bisbenzimide
Author: Seenaa Ibrahem(1), Harith Ibrahem(2)
Abstract: Sol – gel Method was used for the preparation of bisbenzimide H33258doped silica xerogels film , using tetraethylorthosilicate [TEOS, Si(OC2H5)4] as the precursor for the silica network. Silica alcogol was prepared by hydrolysis and polycondensation of ethanol (EtOH) diluted TEOS in the presence of HCL catalyst. Silica solution containing TEOS and pure ethonal were mixed in volume ratio of 5:5 the sol(A) ,and deionized water mixed with HCL and dye solution at volume ratio 10:0.81(0.1M):5 the sol(B) .sol (B) were slowly added to sol(A) with magnetic stirring for two hour at the tamp. of reaction 60ₒC.From the absorption spectra for organic dyes in ethanol it is clearly appear that the dye molecules interactions depend on the local electric fields generated by the surrounding polar solvent molecules. The change spectrum width and the intensity of peak for different concentrations.
Experimental Investigation of Flow through Convergent Nozzle and Influence of Micro Jets on the Enlarged Duct Flow Field
Author: Syed Ashfaq1, S. A. Khan2
Abstract: Airflow from convergent axi-symmetric nozzle expanded suddenly into circular duct of larger cross-sectional area than that of nozzle exit area were studied experimentally, focusing attention on the wall pressure and the flow development in the enlarged duct. The flow parameters considered in this investigation are the Mach number at the nozzle exit and the nozzle pressure ratio. The geometrical parameters considered are the area ratio between the sudden expansion duct cross-section and the nozzle exit area and the length-to-diameter ratio of the duct. In the present study micro jets were used to investigate the effect of micro jets on the flow field in the suddenly expanded duct. An active control in the form of four micro jets of 1 mm orifice diameter located at 900 intervals intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed. The Mach numbers of the present studies were M = 0.9, 0.8, and 0.6 and the area ratio (ratio of area of suddenly expanded duct to nozzle exit area) studied was 4.84. The length-to-diameter (i.e. L/D) ratio of the sudden expansion duct was varied from 10 to 1. From the results, it is seen that the flow in the base region is dominated by the waves, it is proved that the correctly expanded flow is dominated by waves; also, it is found that for L/D in the range L/D = 10 and 8 the flow remains oscillatory mostly for all the Mach numbers. However, these oscillations are suppressed gradually either with the decrease in the L/D ratio in the range 3 to 6 or with decrease in the level of inertia level.
Experimental Analysis and Comparison of Heat Transfer with Different Particle Diameter and Power in Fluidized Bed
Author: Anusaya M. Salwe1, Agosh Kumar1 and Poonam G. Kalambe1
Abstract: This research project is an in-house project and being conducted as to verify the previous data related to fluidized bed heat exchanger. Heat transfer coefficient between immersed heated tube and bubbling fluidized bed is found experimentally for different velocity of air. An experiment is performed with three different silica sand diameters and at different superficial air velocities. The bed particles used were Geldart B silica sand particles of sizes ranging from 300-425μm, 425-650μm and 650-850μm. Fluidizing media used was atmospheric air. Heat transfer coefficient is increased with increasing the air velocity and it is found to decrease by increasing the particle size. The comparison of power, velocity, heat transfer coefficient with different diameter of particles performed in this research work. It is observed that they showed a good agreement with each other.
Experimentally Investigated Effect of Flame Temperature on Performance of Rotary Furnace
Author: Dr. R.K. Jain
Abstract: Energy consumption is major problem being faced by the almost all industries. The natural sources of energy coal, oil, gas etc. are depleting fast. As per the survey conducted and reports published by several national& international agencies the energy consumption in Indian ferrous foundries is much more above the required limits and has to be drastically reduced. This paper deals with the importance of an LDO fired rotary furnace for ferrous foundries .The experimental investigations revealed that by reducing the excess air to 10 % and using preheated air of 2000 C not only the fuel consumption was drastically reduced but also the melting rate was considerably increased.





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